Pattern for skim-gates.



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this specification.

This invention relates to new and useful improvementsin skim gate cores for use 1n connection with metal molding apparatus and the object in view is to produce a simple and efiicient device of this nature and provided for the purpose of separating dirt and, slag from the molten metal as it is poured mto a mold.

The present nvention comprises various details of construction and combinations and arrangements of arts which will be hereinafter fully descri d and then specifi I one end of the core being adaptedto irectcally defined in the appended claim.

My invention is illustrated in the accom- 80 paizi ying drawings, in which 1 through a mold showing a skim gate pattern positioned within the cope of the mold for the purpose of forming a recess for the re- 85 ception of the skim gate core. Fig. 2 is a similar sectional view through the mold and skim gate adjusted in position within the recess in the cope. Fig. 3 is a section on line 3-3 of'Fig. 2, looking in the directionof 40 the arrow. Fig. 4 is a detail perspective view of the skim gate core, and Fig. 5 isa sectional view showin amodification in ,the a plication of the s llim gatecore.

Re erence now bein 5 of thev drawings by let er, A designates the drag of a mold and B the cope in which the sand orother material utilized for making the mold is tamped in the usual manner about the pattern in the formation of the mold.

C designates a gate leading to the mold "and through which the molten metal asses from the recess D which is-formed 1n the sandimmediately underneath the location 5 of the skim gate core E.

In the formation of the mold a skim gate Specification Letters fatent'. Application filed semester-e, 191a. Serial no. 718,948.

re 1 is a vertical. sectional -view.

'sition, it is essential had to the details the metal in striking the skim gate core will pattern, designated by letterF, having preferabl inclined sides as shown in Fig. 1 of the rawin s,. is placed immediately over the moess and pins D are inserted in holes formed in'the upper face of .said pattern and the sand is tamped about the pattern and pins, after which the cope is removed and the pattern and-pins withdrawn therefrom; thus leaving a recess G conforming to the shape of the attern with gates Patented Jan. 7', 1913.

Hand I leading into said recess, the gate I being preferably of a little larger area than the gate H, aflording means whereby the molten metal" may be poured into the mold, while the gate I forms a riser. Said skim gate core, which is. made of any suitable material,-is shaped with inclined edges to conform to and adapted to snugly fit into the recess G in the manner shown in Fig. 2 of the drawings, so that the inclined walls of said core will contact with the inclined ends of the recess G and the flanges 'E of said core will contact with -the bottom wall of the recess at each end and adjacent to said gates H and I. It will be noted also that the inner edges of the. flanges are also inclined, one inclined edge of the flan e at the fiow of the molten metal as it 1s poured into the gate H into a recess N formed intermediate the flanges E toward the tapering apertures J through which the metal passes into-the recess D. ,In the formation of the mold and the adjust-ment of the skim gate in its proper pot at the space and the core be small enough to permit the sand wall of the drag to support the skim gate core and at the same time sufliciently large to take care of all metalwhich may pass through the apertures in the bottom of the core, preferably there should be no holes or apertures in the bottom of the core directly beneath the pouringgate H so that be obliged to flow more indirectly through t e the holes, thus preventing the force of molten metal coming down in the gate from carrying dirt and slag through the apertures of the core.

In Fig. 5 of the drawings, I have shown a slight modification in the application of my invention, in which the cope may be too shallow to permit of the utilization of the skim gate core between the cope and drag and in which modification the core is shown asapplied to the top of the cope with the aid of a runner box. This application of the invention may be utilized when there is not suflicient room beside the casting in the flask or box to use the skim gate in that In said modification themold is formed in the usual manner with gate '1 extending down through the cope and communicating with the recess T formed in the drag from which an inclined gate T leads to the mold. The upper portion of the gate T is recessed away as at T and T designates a skim gate core rested upon the top of the cope and in a recess shaped to conform thereto and which has been previously formed by a suitable pattern in the sand of the runner box S. A pouring gate R is formed in the sand of the runner box and forms means for pouring the moltenmetal into the recess T formed intermediate the flanges at the ends ofthe core and a riser R is formed in the sand of the runner box and communicates with the recess T adjacent to the end opposite to that with which the pouring gate communicates.

In operation, the molten metal as it is poured into the pouring gate will pass into the recess formed intermediate the flanges at the ends of the skim gate core and the opposite walls of the recess previously formed by the pattern block illustrated in Fig. 1 of the drawings. The metal as it is poured through the gate H, or through the gate R in the modified form, will be directed by the inclined end of the flange to ward the tapering holes formed in the bottom of the core and which will tend to separate the dirt and slag from the molten adapted to snugly seat in a recess in the face of the cope, the ends of said core having flanges, the inner edges of which are inclined and form end walls of a recess, the walls to the opposite sides of which recess are' formed of the sand of the cope and into which recess a gate and riser lead, one

adjacent to each end thereof, as set forth.

In testimony whereof I hereunto afiix my signature in the presence of two witnesses.

HERMAN H. LANGE.

Witnesses:

FRANKLIN H. HOUGH, A. L. HOUGH.. 

